Mary Kate and Ashley with Kiki Dunst some years ago. Now they don't get along that well.

Apparently, Mary Kate and Kirsten met at a party in South Beach this week, and they stared at each other for a long time until they started exchanging nasty words. Then MK just got up and left.

It seems that the reason behind all this it's because Kiki's last guy she dated was MK's ex DJ Matt Creed, but what can you do, you are noone in the starlets' world unless you had a catfight with Paris or have dated an ex of Mary Kate.